Things that need to be included in the software design of the PyWrapper:

• Support for several DBMS with different SQL Syntax
  • develop abstraction layer: database modules
• Dynamic SQL needed.
  • Graph representation of the database tables.
• Output +/- directly to stream in contrast to keep all output in memory first. This is needed for good perfomance for larger results.
  • This disqualifies the creation of a single DOM object as the result
• Validation of resulting XML according to custom XML Schemas on the fly.
  • This requires the usage of DOM objects as the result. To still allow streaming of the result, a DOM object could be created per "record" which could be validated +/- properly and then streamed.
• XML Schema parsing to create "Response Structure" objects.
  • objects representing xml schemas. PyWrapper CMF objects are reused for this. The response structure objects represent the entire potential space of valid xml documents based on a schema. There are classes representing XML Attributes, Elements and Choices which can be serialized to enhance performance.